Postage Collage Slimline Blocks DieThe Postage Collage Slimline Blocks Die is designed to work with the Postage Collage Slimline Panel Die and Postage Collage Slimline Stencil. You can also use the frame die on its own to create shaker or shadow box cards! Here are a few ways to use both die sets together: Place the frame die underneath the original panel as a mat layer to make your designs pop. Color, stamp, or stencil in each window cutout separatelyno masking needed! Then stack them